Created a Spiral Curve Shot weapon, Brent should check it out.  I updated Player.lua to include it.  I cleaned up some code in BackshotWeapon.lua and SpiralStraightshotWeapon.lua.  I made SpreadshotWeapon.lua more compatible with multiple arcs.
Merge branch 'master' of https://github.com/encephalopathy/wepwep

Conflicts:
	branches/pewpew_corona_port/com/game/Player.lua